Easy Picture Editing If you only want to crop. resize, rotate or flip - Try it

Advanced Picture Editing If you want the fulle experience of photoshop. - Try it

Browser Picture Editing

Grabber 2.0.3 for FirefoxGrabber for Firefox let you right click on any image in a webpage and load it into pixlr for editing. The firefox add-on also lets you capture the whole or parts of the browser content (Print screen).